Since ​2006 the amount of money spent at restaurants in a certain country has increased at a rate of ​6% each year. In 2006 ​, about ​$300 billion was spent at restaurants. If the trend​ continues, how much will be spent at restaurants in ​2018?

Given: ae ≅ ce ; de ≅ be prove: abcd is a parallelogram. we have that ab || dc. by a similar argument used to prove that △aeb ≅ △ced, we can show that △ ≅ △ceb by. so, ∠cad ≅ ∠ by cpctc. therefore, ad || bc by the converse of the theorem. since both pair of opposite sides are parallel, quadrilateral abcd is a parallelogram.